Roll of adhesive strip



May 31, 1938. o. HERRMANN ET AL 2,119,163

ROLL OF ADHESIVE STRIP Filed June 18 19 34 Patented Mi, 31, 1938 PATENTOFFlCE ROLL or ADHESIVE s'rmr Otto Hermann, Wiesbaden, and PhilippMiiller, Wiesbaden-Sonneberg, Germany, asslgnors to Kalle & Co.Aktiengesellschaft, Wiesbaden- Biebrich, Germany Application June 18,1934, Serial No. 731,176 In Germany July 15, 1933 6 Claims. (01. 206-59)I The 'present'invention relates to rolls of adhesive strip.

f-Rolls of adhesive strip consisting of a base of cellulose hydrate insheet form, or other cellulose .derivative sheets more or less sensitive,to moisture, such as, for example, acetyl'c'ellulose, and a plasticadhesive coating adapted to remain constantly sticky, such as, forexample, a coating containing caoutchouc, are known. Adhesive strips ofthis kind are manufactured in transparent, non-transparent, colourlessand coloured form. The strips which are marketed in diiferent widths andin comparatively long lengths are wound in numerous layers around arimless core which is generally hollow and usually consists ofcardboard. The individual layers are wound tightly upon one another inorder to ensure that the strip may be satisfactorily drawn oil and thatthe roll may present a neat appearance. The known tightly wound rolls ofrelatively narrow adhesive strip exhibit, however, the defect that whenthey are stored for a considerable time they become displaced in'partslaterally away from the core so that the end faces of the roll are nolonger flat but are of an irregular funnel-like shape. The presentinvention relates to means suitable for avoiding this disadvantage.

We have found that the aforesaid deformation which renders the rollsunsuitable for use in unrolling apparatus and, moreover, causes anunattractive appearance can be avoided by completely covering up the'end faces of the rolls to the exclusion of air with protecting disksbearing tightly on the end faces andmade of mate rial which issubstantially impermeable to atmospheric moisture. The protecting diskswhich are of substantially the same size as the sides of the rollconsist of thin foil material, which, in

addition to possessing impermeability to moisture, is also as tough andflexible as possible and is of such a nature that no fibres can bedetached from its surfaces, inasmuch as otherwise a satisfactorycomplete withdrawal of the protecting foils from the somewhat adhesiveend faces of the roll would no longer be possible. Amongst othermaterials aluminium foils of small thickness (about .05 of a millimetre)or other foils having a metallic surface are appropriate.

- It is, however, most advantageous to employ celwith other materialorsheets of paper provided with a moistureproof coating of lacquer orvarnish. v

' The drawing shows more clearly in what man her the invention is to beperformed without limiting the invention to the particular form.

Fig. 1 shows a vertical section of the roll. It shows the core a, theadhesive strip b wound around the core and the protecting foils 'c.

Fig. 2 shows a plan view of the roll.

The protecting disks may be very thin, for example only .02 to .03 mm.in thickness, and may be in the form of circular foils'which, ifdesired, may be stamped out with an opening corresponding to that of thecore of the roll, and which preferably only project slightly beyond theend surfaces of the roll of adhesive strip proper. They are brought intoas intimate contact as possible with the said end surfaces by pressithem thereonto. The small degree of adherence exhibited by the roll atthe end surfaces generally suilices for causing the protecting foils toadhere.

The result obtained by the use of the protecting foils is not limitedonly to the protection of the rolls from lateral displacement during theperiod of storage, inasmuch as the said foils also prevent contaminationwhich could otherwise easily occur in consequence of the slightadhesiveness at the end surfaces, and also facilitates the packing oftherolls.

It has also been found that the effect of the moistureproof closureobtained by means of the protecting foils can be improved by providingthat the core upon which the adhesive strip is the core, or again by theemployment of a core which is made of a material which is impermeable tomoisture.

We claim:

1. A roll of adhesive strip, comprising a strip of cellulose derivativesensitive to moisture coated with plastic adhesive material and wound inlayers, the strip being relatively narrow and the layers beingrelatively numerous so that the roll is subject to deformation under theinfluence of the moisture in air, and thin flexiblt numerous so that theroll is subject to deformation under the influence oi the moisture inair. and thin flexible detachable foil disks of substantially the samesize as the sides of the roll adhering to the edges of said layers andcompletely covering the same to the exclusion of air,

which disks have a surface free from flbres and are substantiallyimpermeable to moisture.

3. A roll of adhesive strip, comprising a core, a strip of cellulosehydrate coated with plastic adhesive material and wound in layers aroundthe core, the strip being relatively narrow and the layers beingrelatively numerous so that the roll is subject to deformation under theinfluence of the moisture in air, and thin flexible detachable foildisks of substantially the same size as the sides 01' the roll adheringto the edges of said layers and completely covering the'sam'e to theexclusion of air, which disks have a surface free from fibres and aresubstantially impermeable to moisture.

4. A roll of adhesive strip, comprising a core,

a strip of cellulose hydrate coated with plastic adhesive material andwound in layers around the core. the strip being relatively narrow andthe layers being relatively numerous so that the roll is subject todeformation under the influence oi the moisture in air, and thindetachable foil disks oi substantially the same size as the sides .5

of the roll adhering to the edges of said layers and completely coveringthe same to the exclusion of air, which disks consist of sheet cellulosehydrate coated with a moisture-proof varnish. 5. A roll of adhesivestrip. comprising a core, a strip of cellulose hydrate coated withplastic adhesive material and wound in layers around the core, the stripbeing relatively narrow and the layers being relatively numerous so thatthe roll is subject to deformation under the influence oi the moisturein air, and thin detachable metal toil disks of substantially the samesize as the sides of the roll adhering to the edges of said layers andcompletely covering the same to the exclusion 01' air.

6. A roll of adhesive strip, comprising a core, a strip of cellulosehydrate coated with plastic adhesive material and wound in layers aroundthe core, the strip being relatively narrow and the layers beingrelatively numerous so that the roll is subject to deformation under theinfluence of the moisture in air, and thin detachable metal foil disksof substantially the same size as the sides of the roll adhering to theedges of said 30 layers and completely covering the same to theexclusion 01' air, which disks are laminated with other material.

o rro. PHILIP? uiium

